Below you can see the front view size comparison of Canon 70D and Canon 760D. Canon 760D is clearly the smaller of the two cameras. Its body is 7mm narrower, 3mm shorter and 1mm thinner than Canon 70D.

Canon 70D vs Canon 760D - Front View

Canon 70D vs Canon 760D - Top View

The chart below depicts how two cameras compare with average dimensions of the cameras in their class.